CN101145696A - Systems and methods for providing parelleling power sources for arc cutting and welding - Google Patents

Systems and methods for providing parelleling power sources for arc cutting and welding Download PDF

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Publication number
CN101145696A
CN101145696A CNA2007101542106A CN200710154210A CN101145696A CN 101145696 A CN101145696 A CN 101145696A CN A2007101542106 A CNA2007101542106 A CN A2007101542106A CN 200710154210 A CN200710154210 A CN 200710154210A CN 101145696 A CN101145696 A CN 101145696A
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coupled
output
transducers
signals
unit
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理查德·A.·爱尔德里得格
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ESAB Group Inc
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ESAB Group Inc
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00—Arc welding or cutting
    • B23K9/10—Other electric circuits therefor; Protective circuits; Remote controls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00—Arc welding or cutting
    • B23K9/06—Arrangements or circuits for starting the arc, e.g. by generating ignition voltage, or for stabilising the arc
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00—Arc welding or cutting
    • B23K9/10—Other electric circuits therefor; Protective circuits; Remote controls
    • B23K9/1006—Power supply
    • B23K9/1043—Power supply characterised by the electric circuit
    • B23K9/1056—Power supply characterised by the electric circuit by using digital means

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • Dc-Dc Converters (AREA)
  • Generation Of Surge Voltage And Current (AREA)
  • Arc Welding Control (AREA)
  • Power Conversion In General (AREA)

Abstract

Disclosed is a system for interdependent control of multiple power sources. The system includes at least first and second power sources for supplying power to an electrical load. At least first and second sensors are respectively coupled with outputs of the first and second power sources, such that the first and second sensors respectively emit first and second signals indicative of the output of the first and second power sources. A comparator unit is coupled to the first and second sensors for comparing the first and second signals emitted by the first and second sensors. The comparator unit is configured for emitting a difference signal indicating a difference between the first and second signals. A controller unit coupled to the comparator unit and at least one of said first and second power sources is configured for controlling at least one of said first and second power sources based on the difference signal.

Description

The system and method for parallel connection power supply is provided for ARC CUTTING and welding
Technical field
The present invention relates to the control system of power supply, relate in particular to a kind of system that makes that power supply can parallel operation.
Background technology
Power supply typically is connected to as the part of circuit needs the one or more electric equipments of energy for operation.The equipment of Lian Jieing is easy to utilize the electric power that provides to carry out function like this, and some of the energy that these devices consume are provided by power supply in this process.Similarly, these equipment, and other energy consumption elements that exist in power circuit (for example resistor and other assemblies) often are called electrical load or are called load simply.In order to make this equipment carry out the function of their expectations, the electric power that q.s must be provided just is power devices to satisfy load, considers every other source of energy consumption in the circuit simultaneously.
In practice, in case definite electricity needs to fixed load is then selected suitable power supply simply from various commercially available power supplys.But, in some applications, can't satisfy by commercially available power supply to such an extent as to the energy requirement requirement is too high.For example, ARC CUTTING and/or welding are used can need great other electric power of level so that carry out effectively.
In this case, can use two kinds of alternative workarounds.The first, can be in question applied customization power supply, with quite high expense.The second, can work out a plurality of commercially available power supplys and arrive load so that electric power to be provided in parallel.Latter's method is more cheap than the former; But this method has shortcoming, and promptly the electric current that is provided by each power supply must independently be adjusted and regulate.In addition, when power supply be constant voltage source (just, by keep the given voltage of crossing over power supply terminal fall operate) time, meet with extra shortcoming, promptly the little difference between two power source voltage settings causes most of electric current, if not all, only provides by one in two power supplys.This tends to coarse slightly many commercially available power supply for voltage specification with control and is a problem especially.
Above considering, exist in the art for the demand of electric power that provide in parallel easy to use to the system of a plurality of power supplys of common load.In some embodiments, system avoids the demand of independent regulation power supply output, and will guarantee power supply shared electric current demand on the degree of expectation.In addition, in other embodiments, system will allow in the power supply one to keep inoperative and reach the threshold value of definition up to the electric current demand, and second power supply will be enabled by system this moment.At last, for some embodiments, system can use one group of parallel connection power supply with expanding.
Summary of the invention
The present invention relates to a kind of system of that in welding or cutting equipment, use, the control that interdepends that is provided for a plurality of power supplys of welding and cutting.In one embodiment, this system comprises at least the first and second transducers of the output that is coupled at least two power supplys respectively.First and second transducers send first and second signals of each output of indication power supply respectively.Configuration is coupled to the comparator unit of first and second transducers, is used for first and second signals that comparison sent by described first and second transducers and the difference signal that sends the difference between indication first and second signals.This system also comprises and is coupled to that comparator unit and configuration are used for being coupled at least one of two power supplys and based on from the difference signal of comparator unit at least one the controller unit at welding or two power supplys of cutting process control.In some embodiments, zero thereby difference signal is changed with the output of at least one in the control power supply in the Configuration Control Unit unit to be substantially equal to.In other embodiments, this system also comprises the calibration unit that is coupled to first and second transducers and comparator unit; At least one value of first and second signals was changed in the calibration unit before being input to comparator unit.In some embodiments again, this system also comprises the output that is coupled to first sensor and is configured to be coupled to the threshold dector of the input of second source.In this embodiment, the configuration first sensor is to be coupled to the output of first power supply, dispose second transducer to be coupled to the output of second source, and threshold dector compares first signal and threshold value from first sensor, and be configured to when first signal during control second source output signal more than or equal to threshold value.In another embodiment, the Configuration Control Unit unit is used for based on two power supplys of difference signal control that send from comparator unit to be coupled to each whole two input of power supply.
The present invention also relates to a kind of system that is used for the control that interdepends of a plurality of power supplys.In one embodiment, this system comprises and is used to provide at least the first and second power supplys of electric power to electrical load.At least the first and second transducers are coupled with the output of first and second power supplys respectively, make first and second transducers send first and second signals of the output of indication first and second power supplys respectively.Comparator unit is coupled to first and second transducers, is used for first and second signals that comparison is sent by first and second transducers.The configuration comparator unit is to send the difference signal of the difference between indication first and second signals.Configuration is coupled at least one controller unit of comparator unit and described first and second power supplys, to control at least one of described first and second power supplys based on difference signal.In other embodiments, power supply provides electric power to one load in parallel, and as selecting, to difference first and second electrical loads.In one embodiment, dispose first and second transducers to detect from the electric current of power supply output.In another embodiment, dispose first and second transducers and make the output electric insulation of they and first and second power supplys.
The present invention also relates to a kind of system that is used to control the electric power that is provided to a plurality of electrical loads.In one embodiment, this system comprises that sensing respectively is input at least the first and second transducers of the signal of at least two electrical loads, and at least one is variable in the electrical load.First and second transducers send first and second signals that indication is input to each signal of electrical load respectively.Configuration is coupled to first and second signals of comparator unit relatively to be sent by described first and second transducers of first and second transducers, and sends the difference signal of the difference between indication first and second signals.Configuration is coupled to the controller unit of comparator unit with one based on the load of difference signal control variable electrical.
Description of drawings
After having described the present invention, referring now to the appended drawings of not necessarily proportionally drawing, wherein with general terms:
Fig. 1 a is the block representation of electrical system that is used for the control that interdepends of two power supplys, and this electrical system comprises the control system according to one embodiment of this invention configuration;
Fig. 1 b is the block representation of electrical system that is used to provide the control that interdepends of two power supplys of electric power to independent load, and this electrical system comprises the control system according to one embodiment of this invention configuration;
Fig. 2 is a kind of block representation of embodiment of the electrical system of Fig. 1;
Fig. 3 is the block representation of electrical system that is used for the control that interdepends of two power supplys, and this electrical system comprises the control system that has the calibration unit according to one embodiment of this invention;
Fig. 4 is the circuit diagram of example embodiment of the control system of Fig. 2;
Fig. 5 illustrates a kind of system that carries out ARC CUTTING, and this system comprises the control system according to one embodiment of this invention configuration;
Fig. 6 is a kind of block representation of electrical system, wherein is used for the output of responsing center's power supply according to a series of control system of one embodiment of this invention configuration and controls the output of a series of power supplys; And
Fig. 7 is a kind of block representation of electrical system, wherein control system is controlled a power supply by the electricity needs of control variable electrical load provides electric power to holding electrical load and variable electrical load, and this control system is the another embodiment configuration according to the present invention.
Embodiment
More completely describe the present invention referring now to appended drawings hereinafter, wherein show more of the present invention but be not whole embodiments.In fact, these inventions can many different forms be implemented, and should not be interpreted as being confined to embodiments set forth here; Yet, provide these embodiments to make the disclosure content will satisfy the applicable law requirement.Spread all in full, similarly the numeral similar elements.
With reference to figure 1a, wherein show the block diagram of expression electrical system 100, it comprises the control system 102 of the control that interdepends that is used for two power supplys 104,106, control system 102 is according to a kind of embodiment of the present invention.Electrical system 100 comprises provides first and second power supplys 104,106 of electric power to electrical load 108 in parallel.As selection, represent in the block diagram as Fig. 1 b that control system 102 can be used for interdependently controlling two power supplys 104,106 that electric power to two an independent electrical load 108,110 is provided respectively.
With reference to figure 2, show electrical system 100 with the block diagram form once more, wherein represent control system 102 in more detail.In this embodiment, control system 102 comprises first and second transducers 120,122, and they are coupled to the output of first and second power supplys 104,106 respectively and send the signal of those outputs of indication.For example, in one embodiment, transducer 120,122 comprises the mechanism of detection by the electric current of power supply 104,106 outputs.As selection, in another embodiment, the output of power supply 104,106 is optical signalling electric currents, and transducer 120,122 comprises the mechanism of detection optical energy intensity.In another embodiment, power supply 104,106 provides dissimilar electric power, and the transducer that uses suitable type is communicated with the output of the power supply that is associated, and for example connects the transducer with the voltage of the output of measuring power supply.
In one embodiment, the output electric insulation of transducer 120,122 and power supply 104,106; The example of this transducer is that the electric current that can measure power supply is exported and the not electric non-contact current sensor that is coupled to the there, for example hall effect sensor.Keep transducer 120,122 and allowed power supply self to keep electric insulation by the output electric insulation of sensing; This electric insulation of power supply has to be avoided not waiting level, or the advantage of not expecting electric current between " grounded circuit " equipment of causing because of electrical grounding.The electric insulation of keeping power supply has the additional advantage that allows dissimilar power supplys to use together; For example, high frequency switch power can be easily and the tapped transformer of thyristor control, and perhaps fixedly the output type power supply uses together.
The control system 102 of Fig. 2 also comprises the comparator unit 124 that is coupled to transducer 120,122.The signal that comparator unit 124 is relatively sent by transducer 120,122 is with the measurement of the difference between the signal of determining to be sent by transducer 120,122, and sends the difference signal of this difference of indication.For example, in specific embodiments, difference signal is indicated the value of the difference of the signal amplitude of being sent by transducer 120,122.Difference signal is delivered to controller unit 126, and it is coupled to second source 106 so that control the output of second source 106 based on difference signal.Second source 106 can comprise the special control input 132 that is used to be coupled to controller unit or is communicated with and receives output order with it.More specifically, second source can comprise first input 132 and permission that allows power adjustment or second input 134 of forbidding power operation.In this embodiment of the present invention, controller unit receives from the difference signal of first and second transducers 120,122 and therefore controls the operation of second source.
In some embodiments, second source can only just be introduced after first power supply reaches selected output threshold value, makes two power supplys always not in operation.For example, as shown in Figure 2, control system 102 can also comprise threshold dector 128.Threshold dector is communicated with the output of first sensor 120, and is communicated with second input 134 of second source 106.Threshold dector 128 is relatively from the signal of first sensor 120, and this signal is indicated the output of first power supply, with threshold value.In some embodiments, threshold value is variable, makes it to select for concrete application.When from the signal of transducer 120 during more than or equal to threshold value, threshold dector 128 is enabled second source 106 by transmitting a signal to second input 134, and it allows the operation of second source.On the contrary, when from the signal of first detector 120 during less than threshold value, threshold dector 128 can be by second input 134 that stops to export or provide null value the to arrive second source second source 106 of stopping using.As mentioned above, can use the control system 102 with threshold dector, in this case, controller unit 126 difference in response signals are controlled the output of power supply 106 continuously.
Above-mentioned control system 102 has several favourable uses.For example, the output that can control second source 106 of the controller unit 126 of control system 102 is the poor of appointment with the change difference signal.Like this, control system 102 is used for keeping the side-play amount in the output of power supply 104,106.In addition, if the difference signal of expectation is appointed as zero, control system is used for the output of balanced power supply 104,106.
With reference to figure 3, wherein show the block diagram of expression electrical system 100, it comprises the control system 102 of the control that interdepends that is used for two power supplys 104,106, control system 102 is according to another embodiment of the present invention.Control system 102 comprises and first and second transducers 120,122, and the calibration unit that is communicated with comparator unit 124 (scaling unit) 130.Calibration unit 130 was used for before signal is input to comparator unit 124 change by or whole two of the value of the signal of transducer 120,122 outputs.Therefore comparator unit 124 is used for form (scaled forms) comparison signal after their calibrations, and the difference between the controller unit 126 response calibration back signals is controlled the output of second source 106.Useful feature as the control system 102 of this embodiment of describing among Fig. 3 is, the output that it is used for keeping power supply 104,106 is proportional to one another and skew each other.In specific embodiments, be zero wherein from the expectation difference between the signal of transducer 120,122, controller unit 126 makes the output of power supply 104,106 directly be proportional to one another.By change calibration unit, in other embodiments, controller unit control second source is to operate as the output of certain selected factor of first power supply.
With reference to figure 4, wherein show the circuit diagram of a kind of embodiment of control system 102 as shown in Figure 3.In this embodiment, first and second transducers 120,122nd, with the current sensor that hall effect sensor is implemented, its electric current that is used for sensing difference first and second power supplys (not having to show) is exported.Select first and second hall effect sensors 120,122 to export proportional voltage to produce with the electric current separately of first and second power supplys; Transducer 120,122 than producing voltage, still has opposite polarity of voltage with similar electric current and voltage.
As will being appreciated by those skilled in the art, the output electric insulation of hall effect sensor and power supply, because the electromagnetic field that their sensings are sent from the lead that is loaded with from the output of power supply, and the current value that calculates from wherein is provided.Keep transducer 120,122 and allowed power supply self to keep electric insulation by the output electric insulation of sensing; This electric insulation of power supply has to be avoided not waiting level, or the advantage of not expecting electric current between " grounded circuit " equipment of causing because of electrical grounding.The electric insulation of keeping power supply has the additional advantage that allows dissimilar power supplys to use together.
In this embodiment, comparator unit 124 and controller unit 126 are implemented in operational amplifier 140.The output 136,138 of transducer 120,122 is parallel to an input 142 of operational amplifier 140, and each output 136,138 is connected with resistor 137,139 separately.The output 144 of operational amplifier 140 and Zener diode 146, resistor 148, and series capacitors-resistor is parallel to first of the second source that is associated with the control input of second source (not have to show) on the function to 150 and imports 132.Similarly, operational amplifier 140 together with element 146,148,150, as comparator unit 124 (Fig. 3) and controller unit 126 (Fig. 3), is handled and is sent and from the proportional signal of the difference between the signal of transducer 120,122.In addition, resistor 137,139 as calibration unit 130 (Fig. 3), because select resistor 137,139 cause operational amplifier 140 to receive the signal of the difference between the output of indication sensors 120,122 to have equal resistance, and for resistor 137,139 select unequal resistance to make operational amplifier 140 receive the signal of the difference between the output after the calibration of indication sensors 120,122.Resistor network 137,139 can for example be replaced by one or more potentiometers by the variable resistance network.
The output 136 of first sensor 120 also is connected to the input 154 of operational amplifier 152.The signals that receive in input 154 are compared with the reference (threshold value just) in input 156 receptions of operational amplifier 152; When during more than or equal to reference, sending the voltage that allows transistor 160 conduction currents and enable relay 162 at output 158 operational amplifiers 152 that are connected to transistor 160 from the signal of first sensor 120 (receiving) in input 154.Relay 162 is connected to second input 134 of second source (not showing) on function, thereby allows the second source operation.Similarly, operational amplifier 152, transistor 160, and relay 162 by only when the output that detects by first sensor 120 surpass with reference to the time permission second source operation be used as threshold dector 128 (Fig. 3).
As discussed above, Fig. 4 illustrates a kind of embodiment of the present invention, and wherein operational amplifier 140 and element 146,148,150 are as comparator unit 124 (Fig. 3) and controller unit 126 (Fig. 3).But the present invention does not need to use these concrete elements.In another embodiment, comparator and controller unit 124,126 (Fig. 3) are implemented in ASIC or microprocessor.Under the situation of microprocessor, microprocessor is by the signal of data-interface reception from first and second transducers 120,122, and the digital signal of the amplitude difference between those signals of generation indication.In some embodiments, microprocessor responds programming or the instruction that receives are relatively being calibrated (scale) signal from first and second transducers 120,122 before them, and in this case, microprocessor also implements to calibrate unit 130.In another embodiment, threshold dector 128 (Fig. 3) is implemented in microprocessor, its by data-interface receive from the signal of first sensor 120 and when this signal equal or exceed with reference to the time enable second source.With reference to receiving or be programmed in the microprocessor by microprocessor.In another embodiment, the reference that receives in the input 156 of operational amplifier 152 at first is connected to potentiometer, makes the value of the reference that input 156 at operational amplifier 152 receives optionally to control by the resistance of revising potentiometer.
The control system 102 that Fig. 5 explanation is used in the plasma cutting is used according to one embodiment of this invention.As described, plasma cutting-torch 10 comprises electrode 10a and nozzle 10b.Power supply 104,106 is parallel to torch.Control system 102 comprises first and second transducers 120,122, the output current of their sensings first and second power supplys 104,106 and send the indication those electric currents signal.Comparator unit 124 receptions and comparison are from the signal of transducer 120,122, and comparator unit 124 will indicate the difference signal of difference to be delivered to controller unit 126.Controller unit is coupled to second source 106 so that control the output of power supply 106 based on the difference of the output current of power supply 104,106.Power supply applies negative electricity together and is pressed onto electrode 10a and applies positive electricity and be pressed onto nozzle 10b and workpiece 14 to be cut.Gas source 16 provides gas to the space between electrode and the nozzle.
During operation, the gas of initial flow is applied to torch and high-frequency and high-voltage is applied between electrode 10a and the nozzle 10b, and sparkover takes place thus.This sparkover comprises the pilot arc between electrode 10a and the nozzle 10b.The formation of pilot arc is created from the positive terminal of power supply 104,106 and is begun, and by nozzle 10b, pilot arc, electrode 10a, and finally turns back to the closed circuit path of the negative terminal of voltage source.When the position of torch during near workpiece 14, the part of pilot arc 18 electric currents begins to flow to workpiece 14, forms main arc 20 thus.At this moment, the pilot arc between nozzle and the electrode is replaced by the main arc between electrode and the workpiece.
The magnitude of current that flows to workpiece 14 from torch 10 during the cutting is determined cutting efficiency, and the demand of this electric current is significant.When electric current draws from power supply 104,106, transducer 120,122 sense currents, and comparator unit 124 is delivered to controller unit 126 with the difference of electric current.Controller unit 126 is used for revising the output of a power supply 106 then and shares to definite amount so that guarantee the electric current demand by two power supplys 104,106.
With reference to figure 6, the present invention can be used for allowing interdependently to control many power supplys with respect to single central source.System 100 comprises first power supply 104, second source 106, the three power supplys 170, and expect nearly many power supplys of n power supply, all power supplys all provide electric power to electrical load 108.First power supply 104 is as central source of power, and its output will be used for controlling the output of other power supplys 106,170.Each power supply except that first power supply 104 has the control system 102a-b that is associated with it of the configuration according to the present invention.The output of the output of each control system 102a-b sensing central source of power 104 and each power supply 106,170 that is associated with each control system.Like this, with respect to the output of the output Controlling Source 106,170 of central source of power 104.
Fig. 7 is the block representation of another embodiment of the present invention, and one of them power supply 104 is used for providing electric power to holding electrical load 208 and variable electrical load 210 with controlled method.Control system 202 comprises first and second transducers 120,122 that are communicated with and send the signal of those inputs of indication respectively with the input of electrical load 208,110.Control system 202 also comprises the comparator unit 124 that is communicated with transducer 120,122.The signal that comparator unit 124 is relatively sent by transducer 120,122 is determined difference and is sent the difference signal of indicating this difference.Difference signal is delivered to controller unit 126, and it is coupled to variable electrical load 210 so that the value of control load 210.
Above system 200 be variable and the performance of this load is unessential when having at least in the electricity needs of at least one electrical load, make can reduce to be provided to the electric power of this load so that provide more electric power under the situation of another load, to expect.An example can be office's ambient illumination device brightness, when such as temperature is higher and more substantial electric power can reduce this brightness need be used for air-conditioning unit the time.
Here Chen Shu of the present invention many modifications and other embodiments will be expected that it has the benefit of the instruction that presents in front description and the appended drawings by the technical staff of these field that the present invention belongs to.Therefore, should be appreciated that the present invention is not limited to disclosed specific embodiments, and revise with other embodiments and plan to be included in the scope of accessory claim.Though use concrete term here, they only use on general and the meaning described and not in order to limit.

Claims (26)

  1. One kind be used for a plurality of power supplys interdepend control system, described system comprises:
    At least the first and second transducers are coupled to the output of at least two power supplys respectively, and wherein said first and second transducers send first and second signals of each output of these at least two power supplys of indication respectively;
    Be coupled to the comparator unit of described first and second transducers, be used for first and second signals that comparison sent by described first and second transducers and the difference signal that sends the difference between indication first and second signals; And
    Controller unit is coupled to described comparator unit and is configured at least one that is coupled to two power supplys, is used for based on from least one of two power supplys of the difference signal of described comparator unit control.
  2. 2. according to the system of claim 1, change difference signal with the output of at least one in the control power supply thereby wherein dispose described controller unit.
  3. 3. according to the system of claim 1, be substantially equal to zero so that the output change difference signal of at least one is feasible in the control power supply thereby wherein dispose described controller unit.
  4. 4. according to the system of claim 1, also comprise the calibration unit that is coupled to described first and second transducers and described comparator unit, at least one value of described first and second signals was changed in wherein said calibration unit before first and second signals are input to described comparator unit.
  5. 5. according to the system of claim 4, wherein said calibration unit is selected from: one or more resistors, one or more potentiometers, and one or more amplifier.
  6. 6. according to the system of claim 1, described system also comprises the output that is coupled to described first sensor and is configured to the threshold dector of the input that is coupled to second source, and wherein dispose described first sensor to be coupled to the output of first power supply, dispose described second transducer to be coupled to the output of second source, and described threshold dector compares first signal and threshold value from described first sensor, and be configured to when first signal is equal to or greater than threshold value control second source output signal.
  7. 7. according to the system of claim 6, wherein second source second input that comprises first input that is used to allow the second source operation and be used to control the output of second source, and wherein dispose described threshold dector and import, and dispose described controller unit to be connected to second input of second source to be connected to first of second source.
  8. 8. according to the system of claim 6, wherein the threshold value of being used by described threshold dector is variable.
  9. 9. according to the system of claim 1, wherein dispose described first and second transducers and make the output electric insulation of they and first and second power supplys.
  10. 10. according to the system of claim 9, wherein dispose described first and second transducers in order to detect from the electric current of power supply output.
  11. 11. according to the system of claim 1, wherein said comparator unit and controller be implemented in send and first and second signals between the operational amplifier of the proportional analog signal of amplitude difference in.
  12. 12. according to the system of claim 1, wherein said comparator unit and controller are implemented in the microprocessor of the digital signal that produces the amplitude difference between indication first and second signals.
  13. 13. according to the system of claim 1, wherein dispose described controller unit, be used for based on two power supplys of difference signal control that send from described comparator unit to be coupled to each whole two input of power supply.
  14. 14. a system that is used for the control that interdepends of a plurality of power supplys, this system comprises:
    Be used to provide electric power to arrive at least the first and second power supplys of common electrical load;
    At least the first and second transducers that are coupled with the output of described first and second power supplys respectively, wherein said first and second transducers send first and second signals of the output of described first and second power supplys of indication respectively;
    Be coupled to the comparator unit of described first and second transducers, be used for first and second signals that comparison is sent by described first and second transducers, and send the difference signal of the difference between indication first and second signals; And
    Be coupled at least one controller unit of described comparator unit and described first and second power supplys, be used for controlling at least one of described first and second power supplys based on difference signal.
  15. 15., be substantially equal to zero so that the output change difference signal of at least one is feasible in the control power supply thereby wherein dispose described controller unit according to the system of claim 14.
  16. 16. system according to claim 14, also comprise the calibration unit that is coupled to described first and second transducers and described comparator unit, at least one value of described first and second signals was changed in wherein said calibration unit before first and second signals are input to described comparator unit.
  17. 17. system according to claim 14, described system also comprises the output that is coupled to described first sensor and is configured to the threshold dector of the input that is coupled to second source, and wherein dispose described first sensor to be coupled to the output of first power supply, dispose described second transducer to be coupled to the output of second source, and described threshold dector compares first signal and threshold value from described first sensor, and be configured to when first signal is equal to or greater than threshold value control second source output signal.
  18. 18., wherein dispose described first and second transducers and make the output electric insulation of they and first and second power supplys according to the system of claim 14.
  19. 19., wherein dispose described first and second transducers to detect from the electric current of power supply output according to the system of claim 18.
  20. 20. according to the system of claim 14, wherein dispose described controller unit, be used for based on two power supplys of difference signal control that send from described comparator unit to be coupled to each whole two input of power supply.
  21. 21. a system that is used to control the electric power that is provided to a plurality of electrical loads, this system comprises:
    Detect at least the first and second transducers of the signal that is input at least two electrical loads respectively, at least one is variable in the electrical load, and wherein said first and second transducers send first and second signals that indication is input to each signal of these at least two electrical loads respectively;
    Be coupled to the comparator unit of described first and second transducers, be used for first and second signals that comparison is sent by described first and second transducers, and send the difference signal of the difference between indication first and second signals; And
    Be coupled to the controller unit of described comparator unit, be used for controlling at least one of variable electrical load of these at least two electrical loads based on difference signal.
  22. 22., be substantially equal to zero so that a change difference signal in the load of control variable electrical is feasible thereby wherein dispose described controller unit according to the system of claim 21.
  23. 23. system according to claim 21, also comprise the calibration unit that is coupled to described first and second transducers and described comparator unit, at least one value of described first and second signals was changed in wherein said calibration unit before first and second signals are input to described comparator unit.
  24. 24., wherein dispose described first and second transducers and make the input electric insulation of they and electrical load according to the system of claim 21.
  25. 25., wherein dispose described first and second transducers are input to electrical load in order to detection electric current according to the system of claim 24.
  26. 26., wherein dispose described controller unit so that be coupled to a plurality of electrical loads, and control a plurality of electrical loads based on the difference signal that sends from described comparator unit according to the system of claim 21.
CNA2007101542106A 2006-09-11 2007-09-11 Systems and methods for providing parelleling power sources for arc cutting and welding Pending CN101145696A (en)

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CN112059368A (en) * 2020-09-18 2020-12-11 唐山松下产业机器有限公司 Multi-power-supply parallel control method and device and welding equipment
CN112427778A (en) * 2020-11-12 2021-03-02 唐山松下产业机器有限公司 Multi-power-supply parallel welding system

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CN105048775A (en) * 2015-08-13 2015-11-11 浪潮集团有限公司 Power source device, power source system and power supply method
CN112059368A (en) * 2020-09-18 2020-12-11 唐山松下产业机器有限公司 Multi-power-supply parallel control method and device and welding equipment
CN112427778A (en) * 2020-11-12 2021-03-02 唐山松下产业机器有限公司 Multi-power-supply parallel welding system
CN112427778B (en) * 2020-11-12 2022-03-11 唐山松下产业机器有限公司 Multi-power-supply parallel welding system

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JP2008072893A (en) 2008-03-27
US20080061045A1 (en) 2008-03-13
PL383326A1 (en) 2008-03-17
EP1897647A3 (en) 2009-03-25
KR20080023660A (en) 2008-03-14
CA2600332A1 (en) 2008-03-11
BRPI0704461A (en) 2008-05-06
AU2007216720A1 (en) 2008-04-03

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